public class Offer_05 {
    /*
     请实现一个函数，把字符串 s 中的每个空格替换成"%20"。
     示例 1：
     输入：s = "We are happy."
     输出："We%20are%20happy."
    * */
    public static String replaceSpace(String s) {
     return  s.replaceAll(" ","%20");
    }
    public static void main(String[] args) {
        System.out.println(replaceSpace("We are happy."));
    }
}
